3 months waiting for cancellation of contract

In February 2015 I logged a case with Telkom mobile to have my contract cancelled on number ***. A form was faxed through to the relevant section. a case was created. Till today I am still waiting. I am told to send the form again, I refuse to do that. A consultant from PMB TDS did all the work of faxing the form through. I am so disappointed and unhappy about this situation. All I want is for the contract to be cancelled.!! An agent called me in April asking me why do I want to cancel when I can just upgrade my contract and I told him I am unhappy, he never called again nor did he assist with my request of cancelling the contract. I have spoken to management at the call centre, a guy called Senzo who promised all will be done. I have spoken to numerous agents, nothing has been done! I am at the point where I don't know what to do anymore.